diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index eae246fa887a1..18a00ae38607e 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -10,7 +10,7 @@ type __pthread_spin_t = __cpu_simple_lock_nv_t;
 pub type vm_size_t = ::uintptr_t; // FIXME: deprecated since long time
 pub type lwpid_t = ::c_uint;
 pub type shmatt_t = ::c_uint;
-pub type cpuid_t = u64;
+pub type cpuid_t = ::c_ulong;
 pub type cpuset_t = _cpuset;
 pub type pthread_spin_t = ::c_uchar;
 pub type timer_t = ::c_int;